Bump FluentAssertions from 8.3.0 to 8.5.0

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.5.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Directory.Packages.props

@@ -5,7 +5,7 @@
   <ItemGroup>
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />
     <PackageVersion Include="DotNet.ReproducibleBuilds" Version="1.2.25" />
-    <PackageVersion Include="FluentAssertions" Version="8.3.0" />
+    <PackageVersion Include="FluentAssertions" Version="8.5.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="4.14.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.14.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />